Type-writing machine.



J. G. DOANE.

TYPE WRITING MACHINE.

.APPLIGATION FILED MAY 1, 1909.

928,856. Patehted July 20., 1909.

- AWW 4 I D v u I A TTORNE UNITED srnrns PATENT- OFFICE.

JOHN G. DOANE, OF HARTFORD, CONNECTICUT, ASSIGNQB TO UNDERWOODTYPEWRITER- 1 COMPANY, OF NEW YORK, N; Y., A CORPORATION OF NEW JERSEY.

TYPE-WRITING- MACHINE.

Specification of Letters Patent.

Patented July 20, 1909.

Application filed May 1, 19l19. Serial No. 493,244.

To all whom it may concern: Be it known that 1, JOHN G. DOANE, a citizenof the United States, residing in Hartford,

. Iul Improvements in Type-Writmg Machines,

in the county of Hartford and State of Con-' necticut, have inventedcertain new and usei of which the following is a specification.

This invention relates to devices for releasably connecting the platento the linespacewheel of a type-writing machine, to pcrinit the platento be rotated independently of the line-space wheel.

The principal object of this invention is to provide a simple anddurable device of this character readily applicable to existing machinesIn the form of the invention illustrated in the drawings, theline-space'whei'is loose 'u on the platen axle, and a nest of friction pates or washers is employed to bind. the line-space wheel to the platen.,Friction plates'positively connected to the platen are alte'rnate'dwithothers that are positively connected to the line-space wheel; and whenall theplates are pressed together they serve to lock to connect theline-space wheel to the laten. Pressure is normally applied to thetriction plates by means of a spring. A finger-ring is slida-blymounted, to operate dogs which release the pressure on the plates, topermit the platen to rotate independently of the line-space wheel. Meansare provided to lock the device in the platenreleased position.

In thev a'ccom anying drawings, Figure 1 is a view of the p aten andplaten frame of an Underwood front strike writing machine,

with the present improvements applied thereto. Fig. 2 is a view partlyin. section and partly in outside elevation showing the improved devicein the platen released posi tion. Fig. 3 is a view similar to Fig.2 butshowing the device in the platen locked position. Figs. 4 and 5 areperspective views of Fig. 6 is a sectionalt'he friction plates. view ofthe platen axle and collar. Fig. 7 shows perspective. views of afinger-piece or ring, a head, a compression-plate or drum,

and a set of friction plates connected to the line-space wheel to rotatetherewith.

' The usual cylindrical platen 1 is fixed to an axle 2-,; whereby it' isjournaled in'a platen frame'3, said axle 2 having fixed upon its endstheus al hand wheels 4 for rotating the platen. The platen is rotated bythe usual I mains stationary, held by the detent 9.

line-spacing mechanism, comprising a lever 5, a slide 6 and a pawl 7,the latter adapted to engage a notched line-space wheel 8, as

usual. The line-space wheel is usually engaged-by a detent or checkspring 9. The line-space wheel is loosely mountedupon a boss or collar10 fixed upon the platen axle 2,

and abuts against a flange or shoulder 11 formedupon one end ofsaidcollar. The

purpose of mounting the-line-space wheel oosely upon saidcollar is topermit relative friction washers 12 are connected 'to the linespacewheel so as to turn therewith by means of lugs 14 projecting from theside of the line-' space wheel parallel with the axle 2, and fitting inrecesses 15 provided in opposite edges of said washers. The washers 13are connected to the platen to rotate therewith by being formed withoblong central perforae tions 16 to fit closely upon the collar or boss10, which is cut' away on opposite sides to form flats or cheeks 17 Theperforations 16 fit this flattened portion of the collar 10.

The i rotation between the-platen and the line- Thus it will be seenthat the washers 13 must always rotate with the collar 10,1while thewashers 12, which have circular perforations '18, may turn freely aroundsaid collar 10, to-

gether with the line space wheel Nor? mally all of the washers, eachof.wh1ch 1s. movable along the collar 10, are packed or pressed.together by a coiled compression.

spring 19 which is confined betweenaplate .20 and a'heac 21 secured byscrews 22 to the end of the collar 10 opposite the flange 11; saidspring being, for compactness, seated n an annular groove 23 formed inthe face of said'head. It will be understood that the spring tendsconstantly to press thBfI'lClZlOIl washers and the line-space wheelagalnst said flange 11-. ---The multiplication 'o:= the-- frictionwasheramultiplies the braking action, so that amoderately strong springis enabled to cause a powerful frictional connect on between one set ofwashers and the other, and hence between the line-space wheel and theplaten; the resistance to a relative movement between the line-spacewheel and the platen being equal to that produced by frictlon betweenany'two contiguous faces of the washers, multiplied by dou ble theaggregate number-of the washers in the two sets. The pressure late maybe' provided with a cylindrical ange 24 to form 'a drum to inclose thetwo sets of friction washers.

To release the platen from the control of the line-space wheel, aknurled ring 25 is provided, fitting loosely upon the periphery of thehead 21 for a sliding movement thereon in a direction parallel with theaxle 2; said the position at Fig. 2, engag ring having'opposite pins 26to project into slots 27 formed in the periphery of the head 21, toprevent displacement or removal of the ring from the head.- The ring, insliding upon said head from the position at Fig. '3'to es cam edges 28formed on' a pair of dogs or heels 30, whereby they are fulcrumed uponsteps 31 formed in recesses 32 provided in the head 21; said dogsplaying in radial recesses 33. Said dogs have toes 34 to catch in eyes35 projecting from the plate 20, so that in. turning from the positionat Fig. 3 to that at Fig. 2, the plate is drawn to the'left against thetension of spring 19, and-therefore the pressure upon the frictionwashers is relieved,

- and hence the platen may be turned freely while the line-space wheelremains stationary.- The cam edges of the dogs are provided with dwellportions 36, whichare engaged by the slip riug25ati-the com letion ofits movement to the osition at ig. 2, so that the dogs, althoug acted onby the spring 19, are

powerless to turn, and have no tendency to revolve therewith and capab eof lateral movement, friction plates alternating ornested with saidfriction plates and mounted on said collar against rotation, -and alsoca- ,pable of axial movement thereon, acap plate, and means to causesaid cap plate to ind, the friction plates together to connect theline-space wheel to the platen.

2. In a typewriting machine, the combination with a platen and'an axletherefon of a evers29, having eluding of axial movement thereon, a capplate, and f means to cause said cap plate to bind the friction platestogether to connect the linespace wheel to the platen, said bindingmeans comprising a sprin confined between the cap plate and a head whichis nxed to said 5 collar.

3. In a typewritmg machine, the combine-- tion with a platen and an axletherefor, of a line-space wheel revolubly mounted upon a collar on theplaten axle and abutting against a flange formed thereon, a plurality off ction disks loosely mounted to turn on the collar and connected to theline-s ace wheel to revolve therewith and capahe of lateral movement,friction plates alternating or nested with said friction plates andmounted on said collar against rotation, and also ca pablc of axialInoyment thereon, a cap plate, means to cause said cap plate to bind thefriction )lates together to connect the linespace W eel to. the platen,said binding means comprising a SPI'III" conimed between the ca plateand a head: which 18 fixed to said co lar, and manuallyo erable means tocause said friction drum and spring to release the clutch.

4. In a typewriting machine, the-combination with a platen and an axletherefor, of a line-space wheel revolubly mounted upon a collar on theplaten axle and abutting a ainst a flan e formed thereon, a plurality ofriction disksloosely mounted to turn on the collar and connected to theline-s ace wheel to revolve therewith and capab e of lateral movement,friction plates alternating or nested with said friction plates andmounted on said collar against rotation, and also capa'ble of axialmovement thereon, a cap plate, means to cause said cap plate to bnid thefriction lates together to connect the linespace w heel to the platen,said binding means comprising a s' ring confined between the ca plateand a sad which is fixed to said co lar, and manually 0 )erable means tocause said friction drum an spring to release the clutch, said manuallyoperable means ina plurality of dogs or levers, fulcrume in recessesformed in said head, and engaging eyes formed on the cap late.

5. In a type'v-sriting machine, t io combination with a platen and anaxle therefor, of a line-space wheel revolubly mounted upon a collar onthe platen axle and abutting agair a flange formed thereon, a pluralityof fi tion disks looselymounted to turn on the ce'i-- id ca plate and ahead 'which is fixed to said co lar, manually operable means to causesaid friction drum-and spring to release the clutch, said manuallyoperable means including aplurality of dogs or' levers, fulcrumed in.recesses'formed in said head and engaging eyes formed on the cap'plate, and a ring mounted on the circumference of the head to slide overcam faces on the arms of the dogs or levers to turn them on theirfulcrums to pull the cap-plate and relieve the pressure on the frictionplates.

6. In a-typ'ewriting machine, the combination with a laten and an axletherefor, of a line-space w 1661 revolubly mounted upon a collar on theplaten axle and abutting against a flange formed thereon, a plurality offriction disks loosely mounted to turn on the collar and connected tothe line-space wheel to revolve therewith and capable of lateralmovement, friction plates alternating or nested with'said frictionplates and mounted 'on'said collar against rotation, and also capable ofaxial movement thereon, a cap-plate, means to cause said cap-plate tobind the friction plates together to connect the linespace' w reel tothe platen, said binding means comprising a s ring confined between thecaplate and a iiead which is fixed to said col ar, manually operablemeans to cause said friction drum and spring to release the clutch, saidmanually operable means in cluding a plurality of dogs or levers,fulcrumed in recesses formed in said head and engaging eyes formed onthe cap-plate, and a .ring mounted on the circumference of the "head toslide over cam faces on. the arms of the dogs or levers to turn them ontheir fulcrums to pull the cap-plate and relieve the pressure on thefriction plates; means being provided to detain the clutching mechanismin the released position.

7. In a typewriting machine, the combination with a platen and an axletherefor, of

a line-space wheel revolubly mounted upona collar on the platen axle andabutting against a flange formed thereon, a plurality of friction disksloosely mounted to turn on the collar and connected to the line-s acewheel to revolve therewith and capab e of lateral movement, frictionplates alternating or nested with said friction plates and mounted onsaid collar against rotation, and also capable of axial movementthereon, a ca plate, means to cause said cap plate to the frictionplates together to connect the line-space wheel to the platen, saidbinding means comprising a s ring confined between thecap plate and alead which is fixed to said collar, manually operable means to causesaid friction drum and spring to release the clutch, said manuallyoperable means including a plurality of dogs or levers,fulcrumed inrecesses formed in said head and engaging eyes formed on the cap plate,and a ring 'mounted on the circumference of the head to slide over camfaces on the arms of the dogs or levers to turn them on their fulcrumsto pull the cap-plate and relieve the pressure on the friction plates;said ring engaging with dwell portions formed on the cam edges of thedogs, to counteract any tendency of the ring to slip off from the dogs.

8. In a typewriting machine, the combination with a platen and aline-space wheel for binding sai'd friction washers together orreleasing them at will, including a spring and a finger piece opposedthereto, one ofsaid spring and finger-piece elementsconstructed to bindthe washers together and the other to release the washers.

10. In a typewriting machine, the.combi-- nation with a laten and aline-space wheel revoluble relatlvely thereto, of a nest offriction-washers some connected to the platen and others to theline-space wheel, means forbinding said friction washers together orreleasing them at will, inpluding a spring and a finger piece opposedthereto, one of said spring and finger-piece elements-constructed tobind the washers together and the other to release the washers, andmeans being pro vided to lock said finger piece in effective position. v

11. In a typewriting machine, the combination with a platen and aline-space wheel, of a nest of washers, certain of said washers havingopenings at their outer edges engaged by a projection upon one of theline-space wheel and platen elements, and others of said washers havingcentral means for con necting them to the other of said elements, andreleasable means for. binding said washers together.

12. In a typewriting machine, the combi nation with a platen having anaxle,-of a loosely mounted line-s ace wheel, a boss or collar fixedonsaid a e a nest ofwashers also mounted on said collar, certain of saidwashers connected to the line-space; heel i Hill and loose on thecollar, and others of said washers alternating with said loosewashersand keyedor splined to the collar to rotate with the platen, and thereleasable means to bind said washers together.

.13. In a typewriting machine, the combi' nation with a platen having anaxle, of a loosely mounted line-s ace wheel, a boss or collar fixed onsaid ax e, a nest of washers also mounted on said collar, certain ofsaid washers connected to the line-space wheel and loose on the collar,and others of said washers alternating with said loose washers and keyedor splined to the collar, to'rotate with the platen, a s ring to bindsaid washers together, a cap-p ateintervening' between said spring andsaid washers, a head having a bearing for said spring, and a lever ordog upon sa1d head to act upon sa1d cap-plate to 0 relieve the pressureupon the washers.

14. In a-typewriting machine, the combination with a platen havinganaxle, of a loosely mounted line-space wheel, a boss or collar fixed onsaid axle, a nest of washers also mounted on said collar, certain ofsaid washers connected to the line-space wheel and loose 011 the collar,and others of said washers alternating with said loose washers and keyedor splined to the collar to rotate with the platen, a s ring to bindsaid washers together, a cap-p ate intervening between said spring andsaid washers, a head having a bearing for said spring, a lever or dogupon said head to act upon said cap-plate to relieve the pressure uponthe washers, and a I ring or finger-piece movable upon said head tocontrol sa1d lever or dog.

JOHN c. DUANE.

\Vitnesses W. M. DYORKMAN, LYMAN D. BOUGHTON.

